calorimetry cornell-alcpg
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Calorimetry Cornell-ALCPG. Calorimetry Detector Study Plans at Colorado Uriel Nauenberg for The Colorado Group The Cornell ALCPG Meeting July , 2003. Calorimetry Purpose. - PowerPoint PPT PresentationTRANSCRIPT
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimetry Cornell-ALCPG
Calorimetry Detector Study
Plans at Colorado
Uriel Nauenberg
for
The Colorado Group
The Cornell ALCPG Meeting
July , 2003
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimetry Purpose
What Drives the Calorimetry Quality in SUSY
In the measurement of 2nd Chargino and
Heavy Neutralinos we need to measure
low energy edge of the Z and higgs.
Need excellent energy resolution for the
ence excellent em energy resolution.
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
SUSY 2nd Chargino
l l combined mass+ -
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
SUSY 2nd Chargino
Z Energy Mass Cut Z Correct Z
0
Z h
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Scintillator Geometry
x-y view z view
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Fiber Placement
Light Correction
Light Correction
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Energy Leakage
30 Layers 35 Layers
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Energy Leakage
40 Layers 45 Layers
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Variations in Energy leakage
30 Layers 45 layers
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Simulation
Calorimeter Energy Resolution2 mm scint., 1.75 mm W, 1 mm space
30 Layers 35 Layers
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Simulation
Calorimeter Energy Resolution2 mm scint., 1.75 mm W, 1 mm space
40 Layers 45Layers
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Simulation
Calorimeter Energy Resolution1.75 mm W, 1 mm space
1mm scint. 2 mm scint.45 LAYERS
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Photon Shower Radii 5 GeV 15 GeV
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Photon Shower Radii 50 GeV 75 GeV
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower Radius
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Method of Obtaining Space Point
Generate Showers with GEANT 4.0
Calculate Position =
x E Ei i
i
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Reconstruction of Position from Energy Sharing
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Position Resolution when Tiles are Offset
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Tiles not offset Tiles offset
About 1.5 cm from edge
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Spatial Resolution Near Center of Tile
Tiles not offset Tiles offset
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Position Resolution Using Forty Layers
5 cm tiles
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Resolution in the track slope near center of tile
Tiles Not Offset Tiles Offset
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Shower
Tile Areas of Simulation
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Photon Showers
Resolution
3 layers read together 5 layers read together40 layers total
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Particle Separation
Standard Model SUSY
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Particle Separation
Betweeen s Betweeen and Charged
Particles
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter-ALCPG
We have built a cosmic ray telescope 15x15 cm
Plan to use 1.3 GeV Muons
Plan to Study
Light Collection Efficiency for a straight fiber
versus a curved fiber using Tyvek and using
3M Super Reflector as a function of the distance
from the fiber.
2
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter-ALCPG
Plan to Study
Fiber Readout with Avalanche PhotoDiodes;study voltage stability, temperature stability;light loss versus fiber length.
Study uniformity of response of variousphotodiodes.
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter-ALCPG
Cosmic Ray rate observed in Boulder is 2
per cm per minute which is twice the expected rate at sea level.
We are building a calorimeter module to study the content of the cosmic rays at Boulder’s altitude while testing our concept of spatial resolution and while waiting for beam availability.
2
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
5 cm scintillator pieces with fiber
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
5 cm scintillator pieces with fibers epoxied
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
Computer Readout
Camac crate and ADC from SLAC
Investigating getting Crate Controller
PCI card interface from Fermilab or
purchase from Kinetic Systems.
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
Planned Measurements
We get ~ 30 cts /h in 5x5 mm
Measure light collection uniformity across 5x5 cm scintillator piece for the 2 kinds of fiber insert
geometry.
2
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Design
Good Resolution (11%/E) Needs 45 layers 770 K 5x5 cm pieces Needs to be Optimized with SIMULATION
7 x 7 cm may be O.K.
2
2
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Pieces Measurements
Measured 13 ordered pieces
x = 50.007 0.020 mm
y = 49.984 0.039 mm
excellent size uniformity
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter R&D
Going to work with a company to determine whether we can meltscintillator grooves with wire
currents.
We did this very well with lead platesand thin aluminum sheets. Then imprint thin grooves 5 cm apart
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
Calorimeter Test Stand
Avalanche Photodiodes Characterize Pulse Height Stability vs Voltage Temperature Rate Uniformity, Linearity, etc.
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder
NLC – The Next Linear Collider Project
Colorado Univ. - Boulder